Affiliation
American Association of Variable Star Observers (AAVSO)
Tue, 09/05/2017 - 19:26
Hi all
In this cycle Khi Cygni hasn't developed a hump in the ascending branch of the light curve. When was the last time showing this behavior?. I'm seeking in the database but i didn't found.... yet.
With some doubts, maybe in 1996?
Regards.
Alfredo Glez-Herrera (GZN)
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I think if you look at every cycle you will find some non-hump periods.
Hi Hubert
Then, it's possible that we are seeing the start of the hump in this cycle (the brightest ever!!) now around 5.8
Well... I have doubts about that.
We have to wait and observe
That's my motto!! Observe, observe and observe .... wait.... and observe again.
Light curve using VStar
hej,8.09.2017,18.46 UT,Khi Cyg 5.60 mag
Khi Cyg is developing a peculiar light curve. Seems that now is showing something like a hump... near the maximum!! , as well as the absence of hump in the ascending branch of the light curve and the bright minimum in this cycle.
I agree with Alfredo, I observe this variable a lot during this cycle, tonight my best estimation was +5.2. Maybe and finaly the hump is on the way, wait and see
Michel
A light curve with 10-day averages spanning 1900-1998 can be found in:
http://adsabs.harvard.edu/abs/1998JAD.....4....8B
The light curve from the date of discovery in 1686 until 1900 can be found in:
http://adsabs.harvard.edu/abs/1998JAD.....4....7S
Eric
Thanks a lot!! Very useful links.
Regards
Alfredo
Anomalies in this cycle? : Bright minimum (around 12.5) the brightest hump ever (around 5.5) and flat maximum ( around 4.6 - 4.8 during more than 40 days)
GZN